Datasheet

ATmega164A/PA/324A/PA/644A/PA/1284/P
 2018 Microchip Technology Inc. Data Sheet Complete DS40002070A-page 57
• Bit 2 – PRSPI: Power Reduction Serial Peripheral Interface
Writing a logic one to this bit shuts down the Serial Peripheral Interface by stopping the clock to the module.
When waking up the SPI again, the SPI should be re initialized to ensure proper operation.
• Bit 1 – PRUSART0: Power Reduction USART0
Writing a logic one to this bit shuts down the USART0 by stopping the clock to the module. When waking up the
USART0 again, the USART0 should be reinitialized to ensure proper operation.
• Bit 0 – PRADC: Power Reduction ADC
Writing a logic one to this bit shuts down the ADC. The ADC must be disabled before shut down. The analog
comparator cannot use the ADC input MUX when the ADC is shut down.
10.12.4 PRR1 – Power Reduction Register 1
• Bit 7:1 – Reserved
• Bit 0 – PRTIM3: Power Reduction Timer/Counter3
Writing a logic one to this bit shuts down the Timer/Counter3 module. When the Timer/Counter3 is enabled,
operation will continue like before the shutdown.
Bit 76543210
(0x65)
– – – – – – – PRTIM3 PRR1
Read/WriteRRRRRRRR/W
Initial Value00000000